A look at how a transaction is constructed
This video is part of a larger online course, "From Barter to Bitcoin: Society, Technology and the Future of Money" run by Prof. Bill Maurer and Prof. Donald J. Patterson In addition to the video on YouTube there is a variety of other content available to students enrolled in the class.
"In 2008, a person calling himself or herself or themselves Satoshi Nakamoto released a paper suggesting a system for an anonymous, peer-to-peer alternative money. Bitcoin was born. Although not the first digital currency ever proposed, nor the first challenger to fiat money, bitcoin is the first to have captured the broad imagination of speculators, coders, regulators, criminals and the mass media. This course puts Bitcoin in context: how do we understand money as a social, political and technological phenomenon? From discussions of ancient transactions to the rise of state-issued currencies, we will explore the social and technical aspects of bitcoin, its predecessors and potential successors, and how its features echo aspects of many different historical transaction systems. No prior knowledge of economics or computing is required.
There is little academic writing on bitcoin. And this may be the first truly academic class on the topic. We want to put bitcoin in a wider perspective, to reflect on what it means for society, politics and economics, as well as how it helps us think about money both a social and a technical phenomenon. This class is not an advanced seminar on bitcoin--we will not be delving deeply into the inner workings of the system, but instead providing a bird's-eye overview with enough technical detail for you to be able to put media stories, hype and hope around bitcoin in perspective. Similarly, this is not a class in monetary economics--we won't go too deeply into monetary theory or policy, the money supply, or inflation. Instead the class invites you to think more deeply about one of the oldest systems of technology on the planet, and most ubiquitous: money, whether coin, cash, credit card or cryptocurrency, we humans have been making money for most of the past 10,000 years. How we do so in the future is a question bitcoin just maybe helps us answer."

Check out my other videos on my Blog http://www.onedailyidea.com
This video is a walk through on how to do a transaction using Bitcoins.
We utilize 2 different apps for this
CoinBase app for the seller: http://blog.coinbase.com/post/44730207780/the-coinbase-android-app-has-launched
Bitcoin Wallet: https://play.google.com/store/apps/details?id=de.schildbach.wallet
We used Android phones but you can use any of the Smart phones on the market for this.

The mechanics of a bitcoin transaction block chain, which is a construct that is generated by bitcoin miners and functions as a global ledger for recording and validating bitcoins.
More free lessons at: http://www.khanacademy.org/video?v=QzDO44oZWtE
Video by Zulfikar Ramzan. Zulfikar Ramzan is a world-leading expert in computer security and cryptography and is currently the Chief Scientist at Sourcefire. He received his Ph.D. in computer science from MIT.

This is part 27 of the Blockchain tutorial.
This tutorial explains:
- What Bitcoin raw transaction is.
- Shows an example of a raw transaction using the very first transaction on the Genesis block.
- What the difference is between big endian and little endian.
- What a satoshi is.
- What a Bitcoin transaction id or hash is and what its purpose is.
- How to calculate the transaction id.
In this video series different topics will be explained which will help you to understand blockchain.
Bitcoin released as open source software in 2009 is a cryptocurrency invented by Satoshi Nakamoto (unidentified person or group of persons).
After the introduction of Bitcoin many Bitcoin alternatives were created. These alternate cryptocurrencies are called Altcoins (Litecoin, Dodgecoin etc).
Bitcoin's underlying technology is called Blockchain.
The Blockchain is a distributed decentralized incorruptible database (ledger) that records blocks of digital information. Each block contains a timestamp and a link to a previous block.
Soon people realises that there many other use cases where the Blockchain technology can be applied and not just as a cryptocurrency application.
New Blockchain platforms were created based on the Blockchain technology, one of which is called Ethereum.
Ethereum focuses on running programming code, called smart contracts, on any decentralized application.
Using the new Blockchain platforms, Blockchain technology can be used in supply chain management, healthcare, real estate, identity management, voting, internet of things, etcetera, just to name a few.
Today there is a growing interest in Blockchain not only in the financial sector but also in other sectors.
Explaining how Blockchain works is not easy and for many the Blockchain technology remains an elusive concept.
This video series tries to explain Blockchain to a large audience but from the bottom up.
Keywords often used in Blockchain conversation will be explained.
Each Blockchain video is short and to the point.
It is recommended to watch each video sequentially as I may refer to certain Blockchain topics explained earlier.
Check out all my other Blockchain tutorial videos
https://goo.gl/aMTFHU
Subscribe to my YouTube channel
https://goo.gl/61NFzK
The presentation used in this video tutorial can be found at:
http://www.mobilefish.com/developer/blockchain/blockchain_quickguide_tutorial.html
The 3 links mentioned in the video are:
- The bitcoin_genesis_raw_tx.txt file
http://www.mobilefish.com/download/cryptocurrency/bitcoin_genesis_raw_tx.txt
- The Bitcoin protocol:
https://en.bitcoin.it/wiki/Protocol_documentation#tx
- The block explorer used in the video:
https://blockchain.info/
The python script to calculate the transaction id:
http://www.mobilefish.com/download/cryptocurrency/calculate_txid.py.txt
The brainwallet tool to convert the raw transaction into a more readable text:
http://www.mobilefish.com/services/cryptocurrency/brainwallet.html
#mobilefish #blockchain #bitcoin #cryptocurrency #ethereum

In this video I explain what a Bitcoin transaction is, what the contents of a Bitcoin transaction are and I present an example of sending and receiving bitcoins.
Featuring content a sample lesson taken from the Bitcoin Advanced Level: Transactions course from Blockchain Institute of Technology (https://BlockchainInstituteofTechnology.com) at:
https://courses.blockchaininstituteoftechnology.com/courses/bitcoin-advanced-transactions
Sign up to receive George Levy's FREE email newsletter and a video email course on blockchain, Bitcoin and cryptocurrency ($47 Value yours free) at:
https://GeorgeLevy.com/Free
Special offer for George Levy channel viewers, open your own Bitcoin wallet for Free and get $10 bonus in Bitcoin:
https://blockchaininformer.com/btcwallet

This is a very basic visual introduction to the concepts behind a blockchain. We introduce the idea of an immutable ledger using an interactive web demo.
Part 2 is here: https://youtu.be/xIDL_akeras
If you are interested in playing with this on your own, it is available online at:
http://anders.com/blockchain/
The code that runs this demo is also on GitHub:
https://github.com/anders94/blockchain-demo
I'm @anders94 on Twitter and @andersbrownworth on Steemit.
Donations:
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ETC: 0xab75ad757c89fa33b92090193a797e6700769ef8

Before we delve into the inner workings of a bitcoin transaction I wanted to explain how the actual bitcoin address is derived from the public key which in turn is derived from the private key.
I take through step by step all the steps required to derived the checksums etc and show with a real example of a real bitcoin transaction.
Also discuss why checksums are included in Bitcoin addresses in order to eliminate the possibility of characters being corrupted, or modified in transit.
This is the cool tool for converted from base 58 encoded value to hex value.
http://lenschulwitz.com/base58
Good link talking about base 58 encoding.
https://en.bitcoin.it/wiki/Base58Check_encoding

What I’m going to do now is show you how a Bitcoin transaction works. Now most transactions work in a similar way whether you’re buying, receiving and so on. So lets jump into showing you how it all works now, so you understand the process.
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This is the first part of a more technical talk where Andreas explores Bitcoin script, with examples from the 2nd edition of Mastering Bitcoin, focusing on the use of conditional statements, flow control, guard clauses and time locks. The examples will include advanced multi-signature scripts, hash time lock contracts and asymmetric revocable commitments. Then he answers questions about Bitcoin's quirky bugs, where Bitcoin differs from Ethereum at a scripting level, how SegWit works, how consensus rules change, and whether Bitcoin is more than just a currency.
Watch Part 2 here: https://youtu.be/pQbeBduVQ4I
This talk took place at the San Francisco Bitcoin Developer (@SFBitcoinDev) meetup on April 3rd, 2017: https://www.meetup.com/SF-Bitcoin-Devs/events/238773843/
Review materials on the topics presented:
Chpt. 7: https://github.com/bitcoinbook/bitcoinbook/blob/develop/ch07.asciidoc
Chpt. 12: https://github.com/bitcoinbook/bitcoinbook/blob/develop/ch12.asciidoc
The fundamentals of Bitcoin script 2:17
Bitcoin's operators 5:00
Creating transactions (P2PKH - Pay to Public Key Hash) 6:30
Public Key CheckSigs, security by obfuscating public keys 7:42
Redeeming the script 9:05
The RIPEMD160 hash operation 12:05
OP_EQUALVERIFY, OP_CHECKSIG, & the elliptic curve digital signature algorithm (ECDSA) 14:05
Summary 18:30
Illustrating scripts: Equal, EqualVerify, CheckSig, CheckVerify, CheckMultisig, CheckLockTimeVerify 19:45
Guard clauses 23:02
Script-based timelocks 24:53
Flow control statements, interactive artificial intelligence 26:50
If, Else, EndIf 28:35
Unlocking scripts, what conditional flows do in Bitcoin 33:55
1-of-2 multi-signature script 35:44
1-of-2 multi-signature script with guard clause 38:28
2-of-3 multi-signature script 41:30
2-of-3 multi-signature script with timelock guard clause 43:20
BIP-113, how time is referenced in Bitcoin 44:42
Backup clause & other nuances in multi-signature schemes 46:58
Game theory, complexity from simplicity 52:36
2-of-3 multi-signature script, unlocking 53:45
RELATED:
Bitcoin: Where the Laws of Mathematics Prevail - https://youtu.be/HaJ1hvon0E0
The rules of Bitcoin (part 1) - https://youtu.be/VnQu4uylfOs
The rules of Bitcoin (part 2) - https://youtu.be/vtIp0GP4w1E
Forkology: A Study of Forks for Newbies - https://youtu.be/rpeceXY1QBM
Irreversibility and consumer protection - https://youtu.be/R107YWu5XzU
Andreas M. Antonopoulos is a technologist and serial entrepreneur who has become one of the most well-known and well-respected figures in bitcoin.
Follow on Twitter: @aantonop https://twitter.com/aantonop
Website: https://antonopoulos.com/
He is the author of two books: “Mastering Bitcoin,” published by O’Reilly Media and considered the best technical guide to bitcoin; “The Internet of Money,” a book about why bitcoin matters.
THE INTERNET OF MONEY, v1: https://www.amazon.co.uk/Internet-Money-collection-Andreas-Antonopoulos/dp/1537000454/ref=asap_bc?ie=UTF8
MASTERING BITCOIN: https://www.amazon.co.uk/Mastering-Bitcoin-Unlocking-Digital-Cryptocurrencies/dp/1449374042
[NEW] MASTERING BITCOIN, 2nd Edition: https://www.amazon.com/Mastering-Bitcoin-Programming-Open-Blockchain/dp/1491954388
Subscribe to the channel to learn more about Bitcoin & open blockchains!
If you want early-access to talks and a chance to participate in a monthly LIVE Q&A with Andreas, become a patron: https://www.patreon.com/aantonop
Music: "Unbounded" by Orfan (https://www.facebook.com/Orfan/)
Outro Graphics: Phneep (http://www.phneep.com/)
Outro Art: Rock Barcellos (http://www.rockincomics.com.br/)

A short introduction to how Bitcoin Works.
Want more? Check out my new in-depth course on the latest in Bitcoin, Blockchain, and a survey of the most exciting projects coming out (Ethereum, etc): https://app.pluralsight.com/library/courses/bitcoin-decentralized-technology
Lots of demos on how to buy, send, store (hardware, paper wallet). how to use javascript to send bitcoin. How to create Ethereum Smart Contract, much more.
Written Version: http://www.imponderablethings.com/2014/04/how-bitcoin-works-in-5-minutes.html
Less technical version: https://www.youtube.com/watch?v=t5JGQXCTe3c
Donation address: 1K7A6wsyxj6fThtMYcNu6X8bLbnNKovgtP
Germain caption translation provided by adi331 : 19s6rqRfHa19w7wcgwtCumPs1vdLDj1VVo (thanks!!)

This developer how to video is a simple example of how to use the bitcoinjs-lib library in order to create bitcoin addresses and build raw transactions.
Bitcoin JS Library: https://github.com/bitcoinjs/bitcoinjs-lib
Examples: https://github.com/coinables/bitcoinjs-lib-Examples

How are transactions stored (and recorded) in the Blockchain blocks? Using a concept called a Merkle tree - in this video I break it down in depth with a simple example and show how a SPV node (Simple Payment Verification) node that does not keep a full copy of the blockchain transaction history - just the headers of the blocks - can verify from an adjacent (but not necessarily trusted) full node, which block a transaction is part of just from knowing the MERKLE PATH from the full node.
http://chimera.labs.oreilly.com/books/1234000001802/ch07.html

This video is for people who wants to use (almost) raw python code to Constructing a Bitcoin transaction.
If you loved this video, show me the love! BTC address:
1LxhkGzGu6q2LSfAGuH2DNBChmLhHkuQzP
In the previous videos I've explained how to connect to the bitcoin network, as well as how to use private and public keys.
I suggest that you'll check out these videos:
https://www.youtube.com/playlist?list=PLH4m2oS2ratfeNpZAoVwPlQqEr3HgNu7S
In this video I'm using the external libraries: ecdsa and base58
You can see the complete code on github:
https://github.com/Shultzi/Mybitcoin
My blog:
http://zeltsinger.com/
Some recommended links:
Bitcoinbook - https://github.com/bitcoinbook/bitcoinbook/blob/develop/ch02.asciidoc#transaction-aggregating
Hen Shirriff's blog -http://www.righto.com/2014/02/bitcoins-hard-way-using-raw-bitcoin.html
The royal fork - http://royalforkblog.github.io/
wiki - https://en.bitcoin.it/wiki/Transaction
https://en.bitcoin.it/wiki/Script
bitcoin.org Developer documentation -https://bitcoin.org/en/developer-documentation

The basic mechanics of a bitcoin transaction between two parties and what is included within a given bitcoin transaction record.
More free lessons at: http://www.khanacademy.org/video?v=9-9_v1wSPBQ
Video by Zulfikar Ramzan. Zulfikar Ramzan is a world-leading expert in computer security and cryptography and is currently the Chief Scientist at Sourcefire. He received his Ph.D. in computer science from MIT.

Do you send Bitcoins from your Blockchain.Info wallet?
Do you often get asked to send the "Receiver/Recipient" the proof of payment, especially the Hash/Transaction ID..??
In this short video, I show you how to find the transaction ID for a "Send" transaction, from your Blockchain.Info Bitcoin wallet.
If you need any more info on Bitcoin, you can comment below, and I'll get back to you.
Cheers, Hugh

My Book: https://www.amazon.com/Building-Bitcoin-Websites-Beginners-Development/dp/153494544X
A simple introduction tutorial to get started with the pybitcointools Python library.
https://github.com/vbuterin/pybitcointools

This is a free sample lesson from 'The Secrets Of The Bitcoin Triangle' course, where you will 'Discover The 21 Fast Track Ways To Make And Save With Bitcoin (Starting From Scratch)'.
You can sign up for the full course at: https://cryptoversity.krtra.com/t/r54RTiOWLIZa
A Bitcoin wallet is a piece of software you use to communicate with the Bitcoin network and tell it when you want to send and receive transactions.
The best way to understand a Bitcoin wallet is by comparing it to email.
Once you have setup an email address you need some kind of software to allow you to send and receive emails to that address.
Now this software may be an app on your phone, it may be an app on your laptop or it could even be an app you log into online.
With email, you enter the username and password for your email address into the app and that’s how the Internet knows it’s really you that is sending and receive emails to that address.
Now of course you tell everyone your email address and you have to do that in order for anyone to send you a message. But just because someone knows your email address, that doesn’t allow them to send email from that address.
If they could that would be bad because then they could send emails pretending to be you and cause all kinds of problems.
In order to be allowed to send email from a particular email address, you have to know the password. If someone finds out your email password then there’s nothing stopping them from logging in to your email app and sending messages.
This is very similar to how a Bitcoin wallet works.
Every Bitcoin account has two elements to it.
One is called your public address, which is like your email address, and one is called your private key, which is like your password.
So just like email, you can give anyone your Bitcoin public address and then anyone, anywhere in the world can send you some Bitcoin.
They don’t need to know anything about you. All they need is that public address and they can send money to you.
Your Bitcoin private key on the other hand is the one thing you must protect. It’s called your private key for a reason because you should never reveal this to anyone.
If someone gets your email password, that’s bad because they can start sending emails from your address, but that’s not quite as bad as someone getting your Bitcoin private key because then they can steal all of your Bitcoins by sending them somewhere else.
And just like email, once a Bitcoin transaction has been sent, it’s a one way trip. The only way to get it back would be for the person you sent it to to voluntarily send it back.
Bitcoin literally works like digital cash. Once you’ve handed it over, the Bitcoin belongs to that other person.
And the same goes for when you receive Bitcoin. Once someone sends it to you, it’s yours and no one can take it from you.
The only way they could do that is if they knew your private key. And of course now you know never to give this to anyone.

What is UNSPENT TRANSACTION OUTPUT? What does UNSPENT TRANSACTION OUTPUT mean? UNSPENT TRANSACTION OUTPUT meaning - UNSPENT TRANSACTION OUTPUT definition - UNSPENT TRANSACTION OUTPUT explanation.
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Source: Wikipedia.org article, adapted under https://creativecommons.org/licenses/by-sa/3.0/ license.
In cryptocurrencies, an unspent transaction output (UTXO) is an output of a blockchain transaction that has not been spent, i.e. used as an input in a new transaction. Bitcoin is the most famous example of a cryptocurrency that uses the UTXO model.
Outputs are a superset of UTXOs. Accordingly, UTXOs are a subset of the outputs superset. Bitcoin UTXO lifespans have been studied.
In the case of a valid blockchain transaction, unspent outputs (and only unspent outputs) may be used to effect further transactions. The requirement that only unspent outputs may be used in further transactions is necessary to prevent 'double spending' and/or fraud.
For this reason, inputs on a blockchain are deleted when a transaction occurs, whilst at the same time, outputs are created in the form of UTXOs. These unspent transaction outputs may be used (by the holders of private keys; for example, persons with cryptocurrency wallets) for the purpose of future transactions.

In this video I go over websocket and how to implement a bitcoin websocket in your website to display new transactions in real-time using javascript and jquery .
My Bitcoin Web Dev Book: https://btcthreads.com/book
Get the code from this video here: http://btcthreads.com/websocket.html
Follow me on twitter: https://twitter.com/coinableS
https://bitcointalk.org/index.php?topic=990348.0

Transactions on a blockchain have to be signed with a private key. This makes sure that people can only spend coins if they have the private key of their wallet.
In this video we will refactor our Javascript blockchain so that it will only accept signed transactions.
We'll use the secp256k1 elliptic curve to generate a keypair. The same algorithm used in Bitcoin. But you can use other algorithms as well.
🤲 Source code
Available on GitHub:
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A block chain is a transaction database shared by all nodes participating in a system based on the Bitcoin protocol. A full copy of a currency's block chain contains every transaction ever executed in the currency. With this information, one can find out how much value belonged to each address at any point in history.
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Every block contains a hash of the previous block. This has the effect of creating a chain of blocks from the genesis block to the current block. Each block is guaranteed to come after the previous block chronologically because the previous block's hash would otherwise not be known. Each block is also computationally impractical to modify once it has been in the chain for a while because every block after it would also have to be regenerated. These properties are what make double-spending of bitcoins very difficult. The block chain is the main innovation of Bitcoin.
Honest generators only build onto a block (by referencing it in blocks they create) if it is the latest block in the longest valid chain. "Length" is calculated as total combined difficulty of that chain, not number of blocks, though this distinction is only important in the context of a few potential attacks. A chain is valid if all of the blocks and transactions within it are valid, and only if it starts with the genesis block.
For any block on the chain, there is only one path to the genesis block. Coming from the genesis block, however, there can be forks. One-block forks are created from time to time when two blocks are created just a few seconds apart. When that happens, generating nodes build onto whichever one of the blocks they received first. Whichever block ends up being included in the next block becomes part of the main chain because that chain is longer. More serious forks have occurred after fixing bugs that required backward-incompatible changes.
Blocks in shorter chains (or invalid chains) are not used for anything. When the bitcoin client switches to another, longer chain, all valid transactions of the blocks inside the shorter chain are re-added to the pool of queued transactions and will be included in another block. The reward for the blocks on the shorter chain will not be present in the longest chain, so they will be practically lost, which is why a network-enforced 100-block maturation time for generations exists.
These blocks on the shorter chains are often called "orphan" blocks. This is because the generation transactions do not have a parent block in the longest chain, so these generation transactions show up as orphan in the listtransactions RPC call. Several pools have misinterpreted these messages and started calling their blocks "orphans". In reality, these blocks have a parent block, and might even have children.
Because a block can only reference one previous block, it is impossible for two forked chains to merge.
• How do Bitcoin Transactions Work? http://www.coindesk.com/information/how-do-bitcoin-transactions-work/
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What is a blockchain and how do they work? I'll explain why blockchains are so special in simple and plain English!
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In this video I discuss the purpose of bitcoin along with an example of how transactions are made and sent. I attempt to explain everything simply at a high-level so anyone can understand.
The following topics are covered in my video:
1. Current Day Transaction - What it takes to send money online to someone else.
2. The purpose of bitcoin.
3. Private Keys/Public Keys/ Public Addresses
3. An example of what information is needed in order to transact in bitcoin.
4. How the nodes/miner interact with the transactions.
5. What purpose the blockchain serves.
6. How a transaction gets approved and appended to the blockchain.
7. How the miners solve the proof-of-work in order to append the transaction block on the blockchain and receive transaction fees/coinbase rewards.
8. Important traits of bitcoin.
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Disclaimers: all opinions are my own, sponsors are acknowledged. Affiliates are: Amazon, Ledger, and Coinbase or otherwise acknowledged!

Our banks usually charge a fee based on a percentage of the transaction amount we are sending. For example, 0.5% for inter-bank transactions. 0.1-1% for transactions across different cities, and for transnational transfers, on top of the commission fees, there are additional cable charges too.
For cryptocurrencies, transaction fees are based on the size of the transaction in bytes, not the amount transferred. For instance, an average Bitcoin transaction takes up 250 bytes, the transaction fee will be around 0.001-0.0015 Bitcoin. If you’re sending Bitcoins to multiple addresses in one transaction, then the transaction will be a larger byte size, hence you may want to pay a higher transaction fee, in order to attract miners to process your transaction.
Yet, from a cost perspective, it is highly advantageous to utilize blockchain technology for cross-border transactions.
Watch the video here!
Huobi Pro will post a question in our Tweet via our Twitter account (https://twitter.com/Huobi_Pro) each time we put up an episode of Blockchain 101 post on our Twitter account, we will randomly select 20 people who answered in the format [UIDxxxxxxxx, correct answer] and retweet our post will be entitled to 1 HT each. Note that the UID entered MUST be a valid Huobi registered account.
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Bitcoin is a cryptocurrency that can help protect your identity when making purchases online. But it's not foolproof. Kevin Mitnick, one of the world's most famous hackers and author of the book "The Art of Invisibility," offers some tips that will help you remain anonymous. Following is a transcript of the video:
The whole idea of really being truly invisible is a disconnect between you as the user and your first connection to the internet.
If you use bitcoin, there is a blockchain. And the blockchain is really traceable.
In fact, during the trial of Ross Ulbricht, the guy that was accused of running the drug emporium Silk Road, they were able to trace millions of dollars of transactions to the wallet on his computer. So to try to anonymize bitcoin, you can go to a bitcoin ATM.
You could buy it from person-to-person on the street, which is probably the safest way if you're using a phone that's not really registered to you. Like a burner device.
Or you could use services that launder bitcoin. So you could buy bitcoin, for example, with a pre-paid card. You can go to any of the pharmacies, buy prepaid gift cards.
You could go to certain sites and actually convert that to bitcoin for a large fee, and then you could go take that bitcoin and launder it even further. They have laundering sites.
So you basically send bitcoin to them, and they'll mix it with other people's bitcoins, and eventually send you bitcoin back with a small fee that's deducted from the transaction.
And then, when you have this clean bitcoin, you could use it, for example, to top up data cards or to purchase email accounts, where you have to sign up for a subscription, to make it really hard to trace you as the anonymous user behind it.
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I wanted to demonstrate that the concept of a blockchain that powers almost all of the modern cryptocurrencies is very simple at its core.
Bitcoin, Ethereum, Litecoin etc all are based on this blockchain technology. Many people think that the blockchain is a complicated thing while at it's core its just a clever use case of hashes.
Enjoy guys!
CODE: https://github.com/ivan-liljeqvist/SimpleBlockchain
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ESSENTIAL CRYPTO RESOURCES
Hardware wallets:
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I found a project (link below) which shows how to connect to the Bitcoin blockchain in Unity, so I took his implementation and rejigged it into this piggy-bank style falling transaction sorter. The live Bitcoin transactions are spawned when they are broadcast to mempool, using the blockchain.info websocket, the spheres are proportional to their BTC value.
Colour code:
less than 0.01 BTC = Size 0.05 orange
less than 0.5 BTC = Size 0.1 yellow
less than 1 BTC = Size 0.2 red
less than 10 BTC = Size 0.4 blue
less than 100 BTC = Size 0.55 purple
less than 1000 BTC = size 0.7 grey
less than 1000 BTC = size 0.9 green
greater than 1000 BTC = size 2.4 cyan
Based on:
https://github.com/spectre1989/bitcoin_blockchain_visualiser

( Blockchain Training : https://www.edureka.co/blockchain-training )
This Edureka Blockchain Tutorial video will give you a complete fundamental understanding regarding Blockchain and Bitcoin. This video helps you to learn following topics:
1. Issues With The Current Banking System.
2. How Bitcoin Can Help Overcome These Issues?
3. Bitcoin Transaction
4. Blockchain To The Rescue
5. Blockchain Concepts
6. Blockchain Features
7. Blockchain Use Case
8. Demo: Banking Use Case
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3. At the end of the training you will be working on a real time project for which we will provide you a Grade and a Verifiable Certificate!
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About the Course
Edureka's Blockchain Course is designed to introduce you to the concept of Blockchain and explain the fundamentals of blockchain and bitcoin. Blockchain course will provide an overview of the structure and mechanism of blockchain. As a beginner, you will be learning the importance of consensus in transactions, how transactions are stored on blockchain, history of bitcoin and how to use bitcoin. Furthermore, you will be taught about the Ethereum platform and its programming language. You will setup your own private blockchain environment using Ethereum. Also, you will develop a smart contract on private Ethereum blockchain and will be deploying the contract from web and console. The course is fed with various use-cases and examples, which makes the learning more interesting.
After completing this Course, you should be able to:
1. Comprehend the cryptography and cryptocurrency concepts
2. Encompass the concept of blockchain
3. Understand the importance of blockchain technology
4. Have a deep insight into bitcoin and its network
5. Perceive, how bitcoin transactions are validated by miners
6. Create and use bitcoin account effectively
7. Understand Ethereum blockchain
8. Learn Solidity: Prominent language to develop smart contracts
9. Deploy your private blockchain on web where you can visually see your chains
10. Send transactions between nodes
11. Develop more than one nodes on same blockchain
12. Making your own cryptocurrency
13. Discuss the compelling use-cases of the blockchain
14. Interpret the prospects of blockchain.
15. Assess, how blockchain can improve your business standards.
-----------------------------------
Who should go for this course?
Anyone having basic programming knowledge and has a zeal to learn new technology can take up the course. Students and professionals aspiring to make a career in the Blockchain technology should opt for the course.
-----------------------------------
Why learn Blockchain?
Blockchain is a revolutionary technology. It is an ordered back linked-list data structure of blocks of transactions stored in a decentralized peer- to-peer network. It is the underlying infrastructure for bitcoin, a popular cryptocurrency. In near future, many companies will be adopting blockchain technologies for trading publicly. Apart from bitcoin, it can be used for a wide variety of applications such as tracking ownership, digital assets, physical assets, or voting rights. It can also store and run computer code called ‘smart contracts’. However, blockchain is still new and the communities are still exploring the best ways in which it can be used.
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Bitcoins are mined using a cryptographic algorithm called SHA-256. This algorithm is simple enough to be done with pencil and paper, as I show in this video. Not surprisingly, this is a thoroughly impractical way to mine. One round of the algorithm takes 16 minutes, 45 seconds which works out to a hash rate of 0.67 hashes per day.
For details, see http://righto.com/sha

Blockchain explorers: blockchain.info, blockr.io, blockexplorer.com
To do a SHA 256 on a string of text: http://www.xorbin.com/tools/sha256-hash-calculator
To do a SHA 256 on a file: https://md5file.com/calculator
My Medium Post that I used to make this video: https://medium.com/@TheAlexGalaxy/what-bitcoin-miners-actually-do-bc80185c0e52#.91ac9ld9h

Transactions - Breaking Down Bitcoin Ep. 5
Blockchain Reader
http://srv2.yogh.io/
4 hex dump add this to a blockchain.info transaction's URL
"?format=hex"
http://bitcoinfees.21.co/
The fee estimation data can be retrieved via a simple HTTP REST API, at https://bitcoinfees.21.co/api/v1/fees/recommended.
For example, on the command line using the curl command:
Using the fee estimation API
$ curl https://bitcoinfees.21.co/api/v1/fees/recommended
{"fastestFee":80,"halfHourFee":80,"hourFee":60}
Donate if you feel like it ! (fees are lower on the weekends, and when sending from a Segwit address)
BTC: 34T8P89oMK1Nm7eGrSWmMWhLWvAbPdiBvT

Hey, Whatsup Bitcoin Lovers, In this video, I am going to show you guys how to get Free Bitcoin Instantly. Just follow the steps below.
1. Please watch the video full
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They're here to provide you free bitcoins in exchange for simple Surveys. There are 3 bitcoin packages - $50, $100 and $2000. You need to complete surveys to earn any of these bitcoin packages, After successfully survey completion you'll get free bitcoins and they receive 5% commissions on each Bitcoin transactions. Our advertisers offer good surveys to enter your wallet address to get started.
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You need to complete easy surveys to gain free bitcoins. Our Advertisers are going to provide you a few surveys, it depends on which package you're choosing. You just need to install a few apps or submit your information or your mobile number and answer some few questions. Example - how many times you use Facebook per week? What you prefer Pepsi or coke, etc.
2. What is a survey?
Surveys can be used to collect information for there business but not us, Completing a survey normally consists of the user filling out some information such as there name, email address and sometimes your mobile number, you will normally be submitting this information to enter a draw or to win some sort of gift card! This is a normal process and you have nothing to worry about. If you are viewing our website using a mobile device the surveys may vary, the most common survey for a mobile user is downloading some sort of app and installing it to there device, don’t worry you can remove the app straight after. Please note you may have to open the app and run for 30 sec with it before the survey is marked as completed.
There are 4 types of surveys:
A. App Download & Install Surveys: Download and install any app then run it for 30 seconds. You can delete the apps straight after.
B. Email Submit Surveys: Enter your email and complete the steps.
C. Mobile No. Submit Surveys: Enter your phone number & verify it to start a weekly subscription. You can cancel at any time.
D. Credit Card Submit Surveys: Enter your Credit Card and Start free trial, You can cancel at any time.
3. What is their profit?
After successfully survey completion you'll get free bitcoins, and they receive 5% commissions of each Bitcoin transactions. Their advertisers give us the chance to offer you free Bitcoins. So in exchange for simple Surveys, you will receive a nice amount of bitcoins to your bitcoin wallet, and they're making commissions form it. Example: If you got $100 free bitcoin, they make $5 commissions directly from advertisers.
Thanks for watching,
Please like, share and subscribe.

Denise Howell, Emory Roane, Matt Curtis and Eric Goldman talk about smart contracts and how using the blockchain in real estate transactions could change the way properties are bought in the future.
For the full episode, visit https://twit.tv/twil/404
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In traditional money transfer transactions for example when a person wants to transfer money to another person, he has to execute that through a middle body such as banks or any other kind of financial institutions. The financial institution act as a guaranteed factor to safeguard the transfer and guarantee the delivery of the money to the recipient against nominated fees agreed upon by both parties.
Blockchain technology can perform the same functions without a medium and can take place between the sender and receiver without the intervention of another body with fewer fees and time and more secure procedure.
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This video is created by iOWN Group, the investment platform of the Future.
To find out more about iOWN please visit our website
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Would you join us in discovering which blockchain has the most transactions daily because knowing this helps determine which cryptocurrency truly is valuable and which is likely to be pure speculation? The reason fiat currencies like USD have value is the ability to transact. A key indication of the true value of a currency is how much it is being used. With cryptocurrencies the same rule applies because a currency that has many users sending and receiving money is worth buying while anything that has a low amount of activity is likely overvalued and best to sell. For example, Ethereum actually has more transactions than Bitcoin today but Steem has more than both of them combined even with a fraction of the number of users! To read more, would you please visit my post on Steemit at https://steemit.com/steem/@jerrybanfield/1-data-point-proving-the-value-of-steem because your comments actually can earn you money here and show exactly why there are so many transactions in Steem?
SUBSCRIBE? Help me reach 200,000 YouTube subscribers at https://www.youtube.com/JerryBanfield?sub_confirmation=1.
THE UNIVERSITY OF JERRY BANFIELD! Would you try enrolling in one of my video courses today at http://u.jerrybanfield.com/ because taking my classes helps each of us make more money online?
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THANKS! I appreciate you reading this and hope you have a wonderful day!
Love,
Jerry Banfield
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How do you keep your digital currency safe? Jerry Brito, Executive Director of the Coin Center, explains how multisignature technology provides increased security for digital currencies such as Bitcoin.
As always, the Federalist Society takes no position on particular legal or public policy issues; all expressions of opinion are those of the speaker.
Follow Jerry Brito on Twitter: @jerrybrito
https://twitter.com/jerrybrito
Related links:
What is Multi-Sig, and What Can It Do?
https://coincenter.org/entry/what-is-multi-sig-and-what-can-it-do
The best multisignature wallets for 2016
https://bravenewcoin.com/news/the-best-multisignature-wallets-for-2016/
The Wretched, Endless Cycle of Bitcoin Hacks
https://www.bloomberg.com/news/articles/2016-08-17/the-wretched-endless-cycle-of-bitcoin-hacks

Baffled by bitcoin? Confused by the concept of crypto-currencies? Well, fear no more. In 190 seconds we explain what bitcoin actually is, where the idea came from and the impact it's having around the world. Is bitcoin the future of finance, a potential destroyer of the economy ... or just a silly slice of technical utopianism?
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Get the whole picture, the whole time ► http://is.gd/9LRxIO
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Uploading contracts to an online database should not take too long, and with the right solution, there should be a way to quickly drag and drop them into folders. Of course, the contract management team may want to give some thought as to how those folders are categorized. In some industries, it may make sense to classify them by agreement type, whereas in others they may need to be grouped by timeframe or date. It is obviously important to do what makes sense for your company and to ensure everyone understands the classification system that is instituted. With this sort of well-oiled system in place, it is a lot easier to keep a handle on things.

Divide and Conquer.
This is another area that is very industry-dependent, but it is highly unlikely that any company can afford to have an entire contract team devoted to managing one portfolio. More than likely, it is more realistic to divvy up the team and the contracts so that there is a leader for each relevant sphere. The entire team will obviously have to coordinate and communicate, but resources must be allocated in the most efficient manner possible. In turn, this will allow for several individuals to keep an eye on a smaller batch of contracts, thereby facilitating those periodic reviews.
Outsource the Tedium to Technology.